01 - Preheat oven to 325°F. Lightly butter a 2-quart baking dish or six individual ramekins.
02 - Combine milk and heavy cream in a medium saucepan. Heat gently over medium heat until just steaming, not boiling.
03 - In a large mixing bowl, whisk together eggs, sugar, vanilla extract, and salt until smooth and pale.
04 - Gradually pour the hot milk mixture into the egg mixture, whisking constantly to prevent curdling.
05 - Strain the mixture through a fine sieve into a large jug to remove any cooked egg bits.
06 - Pour custard into the prepared baking dish or ramekins. Place in a large roasting pan and fill halfway with hot water.
07 - Bake for 40 to 45 minutes, until set but still slightly wobbly in the center.
08 - Remove from oven and cool slightly. Sprinkle sugar on top and caramelize with a kitchen torch or under the broiler for a golden finish.
09 - Serve warm or chilled.